Self-locking pivoted joint



c. s. WINDSOR.

SELF LOCKING PIVOTED JOINT.

APPLICATION FILED FEII. I7, I9I9- I Patented Aug. 10, 1920.

PATENT OFFICE.

CECIL STANLEY WINDSOR, OF LONDON, ENGLAND.

SELF-LOCKING PIVOTED JOINT.

Specification of Letters Patent.

Patented Aug. 10, 1920.

. Application filed. February 17, 1919. Serial No. 277,569.

To all whom it may concern:

Be it known that I, CECIL STANLEY VVIND- son, trading as J as. Bartle & Co, a subject of the King of England, residing at 236 Laucasterroad, Notting Hill, London, England, (whosepost-oifice address is 236 Lancaster road, N otting Hill, London, England,) have invented certain new and useful Improvements in and Relating to Self-Locking Pivoted Joints, of which the following .is a specification.

This invention relates to pivoted joints of the kind which are automatically locked in any desired position. I

According to my invention the joint is locked by a cam block engaging free rollers and can only be unlocked and moved around its pivot by means of a special unlocking device which engages between the rollers and is fixedly or removably mounted to rotate co-aXially with the pivot of the joint.

My invention is intended more especially for application to motor and other vehicle hoods, and motor and other wind screens, but it may be applied to any type of mstrument, apparatus, or mechanism to wh1ch such a self-locking pivoted joint is appli- I will now describe my inventlon'with the "aid of the accompanying drawlngs which are to be deemed illustrative only,'as

modifications and rearrangements of details may be effected without departing from the spirit of the invention. V

Figure l is a partly sectional elevation of the device; H

Fig. 2 is a side elevation of same;

Fig. 3 is a section taken on the line 33 in Fig. 1;

Fig. 4 is an elevation of one of the jolnt members;

Fig. 5 is an elevation of the unlocking device; and

Fig. 6 is a section taken on the line 66 in Fig. 5.

Throughout these drawings like characters of reference denote like parts.

For the sake of clearer demonstration the device may be divided into three principal parts thus :-the two members I) and c forming the pivoted joint and the unlocking device a.

The housing or casing of the joint-member c is bored so as to form a race for the locking details, and is furnished axially with a pivot stem d around which the other memof the boring in her I) of the joint, the unlocking details and the locking device a are free to rotate. The member 0 is provided with a flanged base 0' having bolt holes 0 by means of which it can be secured to the motor vehicle hood or other part.

Journaled upon and free to rotate around the plvot stem (Z is a block 0 having a cam or cams e on its periphery (two are shown in the drawings). In the annular space between the block 0 and the outer boundary the member 0 a number arcuate segments g, (one each cam e on the block 0) are as to be freely movable around of pairs of loose pair for placed so the annular space or race in the member 0.

T. mach segment 9 is provided with a housing to receive the free end of a spring It so as to couple every two together to form a pair,

and is recessed at its other end to receive an anti-friction roller These segments and rollers are so disposed around the block 6 that a roller is on each side of a cam on the block, so that if there is only one cam,

there would be only two segments and rollers, if two cams (as shown in the drawings) four segments and rollers, three cams, six segments and rollers, and so on.

The rollers f and the arcuate segments are prevented from revolving in the annular space surrounding the block 6 by reason of the enlargements forming the cams c, and the pressure of the springs it is such as to force the segments apart and consequently to press the rollers toward the cams so that the block 6 cannot be rotated. This is the normal or locked position of the parts. The

unlocking of the device is effected by the element a hereinafter described.

The member Z) of the joint is either formed integrally with the block 6 or, as shown in F .igs. 1 and 4, it is centered by the aperture 2' upon the pivot stem (Z and is pierced by two holes 70 which fit over and engage studs Z upon the cam block 6, being retained in position by the cover plate m of the unlocking device a.

The unlockin device a is centered at n (Fig. 5) upon the pivot stem (Z, being superimposed upon the member I), and is there retained by the screw 0 and washer 79. Its cover plate m is furnished with a lug or lugs arranged at right angles to its face as shown in Fig. 6, and so shaped and constructed as to bridge the space between each two contiguous rollers f and to press same slightly back against the pressure oftheir springs It; also each lug will abut :against a shoulder Z) on the member Z) which latter,

'as previously stated, is mounted on the stem (Z beneath the device a, see Figs. 2 and 3.

The joint illustrated is manipulated in the following manner :When it is desired to alter the angular position of the member Z) relatively to the member 0, the unlocking device a is moved in the same rotary direction as that in which the element 6 is required to be moved, whereuponthe devicea is, by reason of the clearance 9 between the lugs q and rollers f, thrown slightly out of line with the member Z) but its lugs q force the forward rollers f away from the cam surface 6 in a circular direction, and also by abutting against the shoulders Z) the i said lugs cause the member 6 and the cam except through the cooperation and by the block e to rotate around the pivot stem cl,

'as the rearward rollers 7 cannot act to prevent this. When released the parts will remain in the position where left and it will be obvious that themember Z) is incapable of being moved relatively to the member a movement .of the unlocking device a.

It will be observed that when rotating the unlocking device a the cam block 6, segments g and rollers f all rotate together and carry I with them the member 6 secured to the block a. It will also be noticed that the parts of the joint are effectively locked against relative movement whether the unlocking device a is in the position shown in p the drawings, or whether it is entirely removed therefrom, such removal bemg advisable when it 1s desired to prevent the unauthorized relative movement of the members b and c of the joint.

Having fully described my invention,

what I claim and desire to secure by Letters Patent is 1. A self-locking pivoted ointcomprlsing two parts pivoted together, a cam-block secured to one of the parts, free rollers in a part, spring controlled arcuate segments also free to move in the race and bearing against the rollers so as to cause them normally to lock the cam-block against movement, and a device mounted to rotate coaxially with the pivot of the joint, lugs on said device to engage between the rollers and to bear against said shoulders for the purpose of unlocking the parts and effecting their relative movement.

,3. A self-locking pivoted joint "comprisingtwo parts pivoted together, a cam-block l secured to one of the parts, free rollers'in a race in the other part, shoulders on said part, sprmg controlled arcuatej segments also free. to move 1n the race'and bearing .againstthe rollers so as'to cause them normally to lock the cam-block against movement, and a device carrying lugs adapted to engage between i the rollers to hold them back against the'spring pressure on the free arcuate segments and to bear against the shoulders on said other part, said device be ing mounted to rotate co-axially with the pivot ofthe joint forthe purpose of unlocking the parts and effecting their relative movement.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. V. V CECIL STANLEY WINDSOR.

Witnesses: 7

JANIE T. HAMILTON, ELIZABETH PLIoKnR'r. 

